Cervico-isthmic pregnancy developing within the scar of a previous cesarean section: a case report
© Springer-Verlag 2009
Received: 19 May 2009
Accepted: 13 August 2009
Published: 23 September 2009
The cervico-isthmic pregnancy is a rare event occurring during pregnancy. In this current report, we describe a case of a woman with pregnancy developed within a previous cesarean section scar and successfully treated with conservative management.
Among the ectopic pregnancies, those developing within the scar of a previous cesarean section are considered the rarest kind of ectopic pregnancy, even representing a life-threatening condition . In fact, it is related with a lot of complications, such as spontaneous miscarriage in the first or second trimester of pregnancy or preterm partum [4, 5], uterine rupture, massive hemorrhage, hysterectomy, and maternal mortality . Herman et al.  reported a case of pregnancy implanted on previous cesarean section, which carried to a hysterectomy because of the development of a profound hemorrhage and disseminated intravascular coagulopathy. All these conditions can lead inevitably to fertility loss and to long-term side effects, which decrease the quality of life . In this current report, we describe a case of a woman with isthmic pregnancy developed in a cesarean section scar and successfully treated with conservative management despite an initial erroneous diagnosis of cervical pregnancy.
Since the patient’s clinical condition was stable, we started a medical therapy with intramuscular methotrexate (50 mg daily). After one day, a little vaginal bleeding was present. The blood count resulted as follows—red cell 4.38 × 106/µL, Hb 12.80 g/dl, and white cell 7.60 × 103/µL. The patient was treated with five methotrexate injections spaced out with a daily intramuscular injection of folate. In the last day of treatment, the woman underwent a further abdominal ultrasound examination that evidenced the cervix laterally displaced on the left, cervical flexion angle extremely emphasized, and the uterine corpus extremely retroversed in the Douglas. Transvaginal ultrasound showed in anterior uterine wall and, specifically, at cervico-isthmic level a gestational sac of 15 mm located in deep myometrium with a live embryo. The localization of the ectopic pregnancy resulted on the previous cesarean scar. According to crown-rump length, the gestational age resulted of 7 weeks. The gestational sac was surrounded by a hyperechogenic halo, probably, due to trophoblastic tissue.
In order to avoid a uterine rupture, a surgical intervention was suggested to the woman. A detailed informed consent about the potential risks and complications of a surgical treatment due to this condition was presented to the patient. The woman preferred to undergo to laparotomy to reduce the operative time and to avoid the risk of conversion.
No postoperative complication was reported, and the patient was discharged 5 days after surgery. After 1 year from surgery, the patient’s condition was good. For personal choice, no further attempt to achieve a new pregnancy was made.
As suggested by Vial et al. , the cervico-isthmic pregnancy can lead to live birth. In fact, it can be characterized by a progression that occurs towards the cervico-isthmic space or through the uterine cavity. In this last case, the connection to the cavum uteri could lead pregnancy progress to a viable birth . This issue is the rationale of the choice of an expectant management .
Even if the expectant treatment can be a valid option, it is often associated with an emergency hysterectomy  due to postpartum massive bleeding. In the cervico-isthmic implant, the gestational sac is located between cervix, distally, and the decidualized functional endometrium, cranially . A weakness of the cervical canal plays a role in the pathogenesis of cervico-isthmic pregnancy .
Pregnancy on previous cesarean scar is the rarest form of ectopic pregnancy, and a lot of theories have been suggested to explain its pathogenesis [3, 11–13]. Recently, the rate of cervico-isthmic pregnancy is increased because of enhancement of the in vitro fertilization, embryo transfer, microsurgical techniques, or better and/or early diagnosis , even if the most frequent cause of cervico-isthmic pregnancy is the spreading use of cesarean section . For this reason, gynecologists must always suspect the possibility of a cervico-isthmic pregnancy in women with a previous cesarean section scar . The diagnosis of pregnancy on cesarean scar is easily made by transvaginal ultrasound and color Doppler flux, which allow the determination of its localization, age, size, and viability . The magnetic resonance imaging can be used to confirm the diagnosis .
Unfortunately, in some cases, as well as in the current, the diagnosis cannot be simple. In fact, when the gestational sac is located in the lower part of the uterine cavity, it became difficult to differentiate from a spontaneous miscarriage, a cervical pregnancy, or a cesarean scar pregnancy . The criteria, which should be present to diagnose the cervico-isthmic pregnancy, are as follows: (a) empty uterine cavity and cervical canal; (b) development of gestational sac in the anterior uterine wall at the isthmus (site of the previous cesarean section scar); (c) evidence of functional trophoblastic circulation at Doppler examination, defined by the presence of an area of increased peritrophoblastic vascularity at this examination ; (d) absence of healthy myometrium between the bladder and sac ; (e) demonstration of a discontinuity at level of the anterior wall of the uterus (on sagittal plane, when ultrasound rounds through the amniotic sac) [8, 13].
To date, there is not a standard treatment for this kind of ectopic pregnancy due to the rarity of this condition. In case of isthmic pregnancy, the treatment of choice is the interruption of pregnancy in the first trimester of gestation . Several management options have been proposed to terminate pregnancy and to preserve the uterus . The two main treatment options are a surgical approach or a medical one.
Larsen and Salomon  firstly reported a case of a pregnancy implanted on cesarean scar, and they used laparotomy to remove gestational sac. Godin et al.  suggested an injection of potassium chloride in the fetal thorax and local methotrexate in the gestational sac or systemic methotrexate injection. Nawroth et al.  also described the effect of local and systemic methotrexate administration.
The use of dilatation and curettage has been also described as treatment for cesarean scar pregnancy when the area of the gestational tissue is misdiagnosed [19, 21]. Furthermore, other authors  suggested that dilatation and curettage is contraindicated for this kind of ectopic pregnancy, since they are considered as cause of uterine perforation and intractable bleeding and consequently, hysterectomy.
Valley et al.  suggested a minilaparotomy incision in order to remove the gestational tissue complicated by hemorrhage during hysterectomy. Yang et al.  proposed a conservative treatment followed by a transarterial embolization of bilateral uterine arteries, performed to avoid intraoperative hemorrhage and postoperative bleeding. This technique preserves uterus and reduces the morbidity . Arslan et al.  for a pregnancy on previous cesarean scar performed a suction curettage with Karman cannules under transabdominal ultrasonographic guidance and suggested that this technique can be used in selected cases (early diagnosed, without symptoms that necessitate emergency intervention).
An early diagnosis of cesarean scar pregnancy consents to undertake a conservative treatment . If the pregnant reported no clinical evidence of suffering, such us bleeding or abdominal pain, and the diagnosis is made at an early stage, we can consider a conservative management with systemic or local injection of methotrexate, potassium chloride, and hyperosmolar glucose [17, 21, 27–29]. However, recent reports evidenced that the cases treated with local or systemic methotrexate, often required laparotomy due to massive hemorrhage . Lee et al. , in a retrospective review, enlisted nine women diagnosed with ectopic pregnancy on previous cesarean section scar; seven of them underwent laparoscopic treatment, thus, the gestational sac was removed by laparoscopy without converting to laparotomy, and the scar defect was repaired by intracorporeal sutures. Therefore, the laparoscopic management of pregnancy implanted on previous cesarean scar could be considered the gold standard treatment. In fact, laparoscopy allows removal of the gestational sac and to repair the scar’s defect, preserving the uterus and the fertility.
In our case, the patient, at first, underwent to conservative treatment with intramuscular methotrexate injections. Then, after 5 days of management, the transvaginal ultrasound still showed a gestational sac with 15 mm live embryo. Thus, the patient underwent to laparotomic removal of cesarean scar pregnancy to avoid or to minimize the risks and the complications. Fortunately, in this case, the abdominal treatment was effective and safe. A laparoscopic approach was also proposed to the woman, but she was clearly informed on the paucity of scientific data at regard and on the potentially high complexity of the procedure. Thus, she chose the traditional approach with abdominal transverse incision.
In conclusion, an early diagnosis and an immediate management of pregnancy implanted on previous cesarean scar are necessary to avoid the severe complication of this kind of ectopic pregnancy and to preserve the woman’s fertility and the possibility of future pregnancies. Even if the rarity of this clinical event pays the forfeit of the absence of a standardized treatment, a conservative approach should be always attempted.
Conflicts of interest
There is no actual or potential conflict of interest in relation to this article.
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